Commission Calculator

This Node.js application calculates commission fees for transactions based on a provided JSON input file. The calculator handles both "cash in" and "cash out" operations for natural and legal persons, applying specific rules and weekly limits.

Requirements

• Node.js (v18 or higher recommended)

Installation

npm install

Usage

1. Input Data:

   • Provide transaction data in a JSON file (e.g., input.json). The file should contain an array of objects, with each object representing a transaction:

     [
       {
         "date": "2023-12-01",
         "user_id": 1,
         "user_type": "natural",
         "type": "cash_in",
         "operation": {
           "amount": 200,
           "currency": "EUR"
         }
       }
     ]

2. Run the Application:

   node app.js input.json

   Replace input.json with the name of your input file.

3. Output:

   • The calculated commission fee for each transaction will be printed to the console, each on a new line.

Running Tests

This project uses Jest for testing. To run the tests:

npm test

Commission Rules

Cash In:

• Commission fee: 0.03% of the total amount.
• Maximum commission fee: 5.00 EUR.

Cash Out:

Natural Persons:

• 1000.00 EUR per week (Monday to Sunday) is free of charge.
• Commission fee: 0.3% of the amount exceeding the free allowance.

Legal Persons:

• Commission fee: 0.3% of the amount.
• Minimum commission fee: 0.50 EUR per operation.

Rounding:

• Commission fees are rounded up to the nearest cent (0.01 EUR).

Code Structure

• app.js: Contains the main application logic, including commission calculation functions and transaction processing.
• __tests__: Contains the Jest test suite for the application.